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Right Angle! (:
Right angles are formed by perpendicular lines. If the lines would extend, to make two intersecting lines, they would form four right angles. Perpendicular lines are written like this: . From its shape, you can already tell that it forms at least two right angles.
A perpendicular line is formed when two lines meet at a right angle. Opposite angles in a perpendicular line are parallel to each other.
If they share a ray, then they are basically combined together and since complementary angles add up to 90 degree angles a right angle is formed.
Vertical Angles or 4